More detailed README.md

Author: bixuehujin

README.md

@@ -4,6 +4,12 @@
 [![Latest Stable Version](https://poser.pugx.org/blink/redis/v/stable)](https://packagist.org/packages/blink/redis)
 [![Latest Unstable Version](https://poser.pugx.org/blink/redis/v/unstable)](https://packagist.org/packages/blink/redis)
 
+## Features
+
+* A Redis Client compatible with [Predis](https://github.com/nrk/predis) API
+* Implemented PSR-16 SampleCache
+* A Session Storage class to store sessions into redis
+
 ## Installation 
 
 You can install the latest version of blink-redis by using Composer:
@@ -12,3 +18,53 @@ You can install the latest version of blink-redis by using Composer:
 composer require blink/redis:dev-master
 ```
 
+## Documentation
+
+### Configuring a redis service
+
+You can easily configure a redis service in the services definition file which located to `src/config/services.php` by default. 
+
+The following is a sample example:
+
+```php
+'redis' => [
+    'class' => blink\redis\Client::class,
+    'servers' => ['tcp://127.0.0.1:6379'],
+]
+```
+
+Once the redis service configured, we can access redis server through `app()->redis` in our application. As 
+The Redis component is based on [Predis](https://github.com/nrk/predis), you can refer their documentation on
+how to issue command to redis servers.
+
+### Using redis as a cache service
+
+The component provides a PSR-16 SampleCache implementation which using redis as a cache storage. We can define 
+a cache service in `services.php` likes the folowing:
+
+```php
+'cache' => [
+    'class' => blink\redis\cache\SampleCache::class,
+    'redis' => 'redis', // The redis service to store cached data
+    'prefix' => '',     // The prefix of cached key
+]
+```
+
+Once the cache service configured, we can access the cache service through `app()->cache` in our application.
+
+
+### Using Redis as session storage
+
+The component also provides a Session Storgae class which allows Blink to store application sessions into redis.
+we can configure the session storage in the following way:
+
+```php
+'session' => [
+    'class' => blink\session\Manager::class,
+    'expires' => 3600 * 24 * 15,
+    'storage' => [
+        'class' => blink\redis\session\Storage::class,
+        'redis' => 'redis',  // the redis service to store sessions
+    ]
+],
+```